Reamer



C. O. SCHELLENBACH BEAMER Filed May 3. 1921 April s, 1924.l

Patented Sip-r. lQDZe.

Frs o man llblli il S l. .er l

CHARLES 0. SCEELLENBGH, @E CQC-.NNATL GEO.

nua-sana.

Application led may 3,

To all whom t may concern:

Be it known that l, Gnarles Q. Sonna- Ln'NBnCi-i, a citizen of the United and residing at Cincinnati, in the county ol llana ilton and State ot Ohio, have invented a new and useful improvement in a Beamer, or' which the following specification is a full disclosure.

My invention relates to an expanding removable blade reanier, in which the blades areV longitudinally lexed for rearner expansion.

An object oi the invention is to provide a reanier with removable blades, placed longitudinally of the reainer body, to be uniiorinly flexed longitudinally for an expansion by the Iexpanding member disposed parallel with and centrally between the lade, and thrust transmitting rneinber lor each blade cooperating with the expanding rneinber and at an angle thereto.

Another object of the invention is to provide a removable blade expanding rearner wherein the expansion is produced by longitudinally flexing the blades, the parts being cornpactly arranged oi simple and durable construction, for an increased degree or' reanier expansion.

Other objects and a vantages will be more ully revealed in the following description oi". the drawings, forming a part or this speciiication, and in the drawings like characters of reference denote corresponding parts throughout the several views, of which:

Fig. l is a side view of the rea-nier with the shank end omitted, which may be of any lengthA and 'formed with a squared end or otherwise to ineet the commercial re- -ouireinent for cnuclring the tool.

Fig. 2 is a section through the reanier on line 2, 2, Fig. 2, showing the blade in its non-expanded position.

Fig. 3 is a section online 3, 3, Fig. 2. Fig. d is a section, similar to Fig. 2, showing the blade in an expanded position.

liig. 5 is a section taken on line 5, 5, Fig. il.

Referring to the drawings, l indicates the tool body of round bar forno, having a central longitudinal bore 2, extending from one end, with the orward end portion 3 threaded for receiving the threaded end l of the expanding mandrel 5. rl`he body peripherally 'is provided with a series or plurality of longitudinal cutter blade re- 1921. Serial N0. 6&509.

ceiving slots 6, the number being optional, and determined by the size and class of worl; for which the rea-incr is intended. ln the orrn shown, the blade slots are off uniiorni dimension and spaced about the body, rendering the blades interchangeable since all are of duplicate construction. A detailed description of such duplicate parts therefore will be confined to the singular.

rlhe blade slot preferably is disposed with its longitudinal axis diainetric with the axis. or" the base 2 or expander. The blade slot has its opposite ends rounded for convenience in manufacturing. The body adjacent each end of the blade slot is radially counterbored to receive the blade clamping screws 7, '7, the heads oi the screws projecting into the blade slotfor engagement respectively with opposite ends of the cutter blade 8 seated or nested within the slot. The blade S in outline corresponds to the outline orn the slot, having its opposite rounded ends notched to provide the shoulders 9, 9, for engagement beneath the heads of the clamping screws 7, 7. lt is obvious that other rneans may be employed or anchoring the opposite ends of the blade within the rea-nier body, although the means herein employed are of simple and en'icient constr iction, providing for a quick and convenient insertion and removal ol' the blades.

The blades illustrated are oi the plural cutting edge type, -providing two cutting' edges l0, 1G, with longitudinal clearance groove ll, between thern and with the cut` ting edges extending only a portion oi the blade length. The under side ot the blade presents a plane surface and is transversely grooved at an intermediate portion across its width, as at l2, for reducing the body thickness ol" the blade at such portion, rendering the blade more nexible and increasing its degree ot longitudinal flexibility. For flexing and expanding the blade, the exoander rod or mandrel 5 is provided with a conical portion or end 13, as wedge element, engaging a ball ld soclreted within a r dial bore or opening l5, through the wall of the reainer body between the central bore and blade slot, the ball furnishing a universal connection between the conical portion of the expander and the base surface of the blade, whereby the ball is nioved or adjusted radially upon adjusting the expander for flexing the blade.` To expand the blade, the expander is screwed or threaded within the bore of the reamer body, whereby its inclined or conical surface engages the ball and forces the same outwardly against the under side of the cutter blade, flexing the blade longitudinally, as shown in Figs. 4 and 5, increasing the cutting diameter of the reamer. This form and method of expanding the blades provides for a uniform and equal expansion of all of the blades, and a considerable increase in the range of expansion over other methods heretofore employed.

The degree of expansion of the reamer is thus produced by longitudinally flexing the blades, and the expander rod lying parallel with the blade and centrally lengthwise of the reamer body, exteriorly accessible from one end, provides a simple and compact construction. The expander rod being rotatively advanced results in a rolling motion between the wedge or conical surface of the expander rod and the thrust transmitting balls, which are moved transversely during the advancing of the rod, flexing the blades longitudinally and gradually with each revolution of the rod. This permits of a comparatively free yadjustment of the expander rod and a uniform flexing of all of the blades. The blades at their opposite ends are rounded at the base edges, allowing the blades to be flexed without injuring the blades and clamping screws, and provide for a rolling motion or rocking action as the thrust is brought intermediately against the blades.

Having described my invention, I claim:

An expansible reamer, comprising a body having an axial bore and lengthwise peripheral cutter blade receiving recesses symmet: rically disposed about the axis of the body, cutter blades respectively seated within said recesses, fastening devices for each blade removably secured into the body respectively engaging the opposite ends of a blade, a tapering expander member adjustable within the bore of the body, and balls l0- cated in respective passages between the reeesses and bore providing transverse thrust members between the blades and expander member for {iexing the blades to expand the reamer, each cutter blade having the inside edges of its opposite ends rounded adapting the blade to rock at its ends with the flexing of said blade.

In witness whereof, I hereunto subscribe my name, as attested by the two subscribing witnesses.

L. A. Been,

FRANCIS E. ALBEN. 

